.386
.model flat,stdcall
option casemap:none

include windows.inc
include user32.inc
include kernel32.inc

includelib user32.lib
includelib kernel32.lib

.data
szCaption 	db 		"HelloWorld", 0
szContent 	db 		"This is Hello World in MASM", 0

.code

start:
	invoke MessageBoxA, NULL, addr szContent, addr szCaption, MB_OK
	invoke ExitProcess, NULL
end start